Electronic cigarette



FIG. 1 is a front perspective view of the new design for an electronic cigarette;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a left side view thereof, the right side view being a mirror image of the left side view;

FIG. 4 is a front view thereof; and,

FIG. 5 is a rear view thereof.

The broken lines shown herein depict environmental subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for an electronic cigarette, as shown and described. 